Remove blank token attributes from data sources

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Tokens are usually only accessible when they are created. Therefore, the majority of datasources cannot retrieve the token values. However, some datasources still include the token attribute, with a blank value.

This issue is to identify and remove all token attributes from data sources. It is a breaking change and will be part of the 19.0 release.

Edited by 🤖 GitLab Bot 🤖